The phrase "bogus argument" refers to a false or misleading statement someone uses to support their point of view. It means that the argument is not true or valid. Full definition
And Chief of Staff John Kelly seems to have lost control over the process, to the extent that even the joint efforts of the secretaries of state and defense couldn't convince Trump to avoid making the totally bogus argument that reliance on foreign steel harms American national security. (vox.com)
Everyone in America also knows that the GOP is tapping this underground racist sentiment and prepping them with bogus arguments. (religion.blogs.cnn.com)
Campaigners allege bogus arguments have been made in favour of claim. (babymilkaction.org)